Disclaimer: I'm not J.K. Rowling, and none of these characters are mine, except Rory. Quotes and such are all from the first book, Harry Potter and the Sorcerer's Stone.
Prologue
Molly Weasley awoke with a start, her maternal instincts kicking in as she heard a child begin to cry somewhere within the thin-walled cottage. Thinking it was Ronald, her nine month old, she quietly sneaked out of bed to the cradle by the door. Seeing the slumbering infant did nothing to alleviate her worries.
Silently creeping out of her bedroom, the crying increased in volume tenfold. It sounded as if were coming from outside the small house.
Her mind fresh with the remembrance of the articles in the Daily Prophet, Molly clenched her wand tightly in her hand as she mustered up her courage and opened the front door with a flourish.
The welcoming rush of cool air didn't ease her shock at the sight her eyes beheld. A small babe, only a few days old at most, laid nestled within a swath of pale pink blankets upon her front doorstep. A small note was tied loosely around it's pink wrist. With trembling hands, Molly picked up the wailing newborn and cradled the freezing bundle until it quieted into her warm arms with a contented sigh.
Quickly, now that the initial shock had worn off, she went back inside. With a wave of her wand the door was locked behind her. Another wave accompanied by a muttered incantation and a silver wisp shot out of the small room with a message. Scampering back to her room, she woke her husband Arthur with a frantic shaking of his shoulders.
"Arthur!" she whispered loudly, trying her hardest not to upset the tempermental bundle in her arms. "Arthur, wake up, I've called Dumbledore!"
The father of her children rolled over onto his stomach with a shake of his head. "'is early," he mumbled incoherently into his pillow.
A nonverbal Stinging Hex woke him with a yelp. "Ow! Molly! What's gotten into you!" he cried, clutching his arm with a wounded look.
A sudden squeal from the object in her arms made him still. "Molly?" he asked dazedly, staring at her bemusedly.
"I…I found her on the doorstep, Arthur," she admitted quietly as she soothed the baby back into silence with a practiced touch. "She's was absolutely freezing cold, and she came with only this." She handed him the note.
"Care for my precious Aurora," he read aloud. His bright blue eyes met hers in bewilderment. "Signed by N.M. You don't think––"
"I don't know what to think," she confessed. "It's too good to be true. All these years of wanting a girl and suddenly I find one on our doorstep in the middle of the night. And why us, Arthur? We barely have enough money as is––" she had to stop herself there, her voice shaking under the force of tears. Ever the dutiful husband, Arthur practically leaped from the bed in his hurry to comfort her. She leaned into his chest gratefully. It seemed that practically everyday Molly broke down these days, ever since the news that the Potter's had been murdered. That, combined with the stress of her two older twin brothers dying in a Ministry raid, made her even more vulnerable. Neither of them were allowing themselves to hope that You-Know-Who was truly gone, even though it did seem that the rate of random acts of brutality had decreased dramatically.
It seemed that she'd only just wiped away the last of her tears when they both heard the tell-tale signs of the Floo Network; a sudden whoosh when the fire blazed up suddenly, the soft footsteps on the carpet.
Albus Dumbledore, leader of the Light, presented them a gentle smile when they reached the living room. He stood with his wrinkled hands clasped before him, his pale blue eyes twinkling behind half-crescent glasses despite the early hour. He wore a disarmingly bright pink night gown, along with a matching night cap, and his long white beard was braided neatly. He gestured at her with a genially. "Am I correct in assuming that this is behind such a frantic Patronus, Molly?"
She nodded, a motherly hand absently stroking the small hand resting in her arms. Arthur handed the note to the older wizard with his left hand, his other arm still wrapped around Molly's waist comfortingly. Albus merely raised an eyebrow before nodding to himself.
"Would you agree to a new family addition?" the grandfatherly man asked her gravely.
Her eyes met Arthur's and they spoke in the way most couple's learned to; subtle shakes of the head and raised eyebrows. After a few moments she turned back to her retired Transfiguration professor. "We'll keep her," she answered.
The twinkle in those knowing eyes seemed to increase. "Would you allow me to do the honor of informing the Order of your newest family member?"
Molly hesitated before nodding.
"Then I leave you to welcome her to your family." With a wink, he spun on his heel and Disapparated.
Leaving the Weasley's to throw the biggest party they'd had in over a decade.